AIR TO WATER HEAT PUMP USER MANUAL

Transcription

1 AIR TO WATER HEAT PUMP Domestic Hot Water Series USER MANUAL Installation Operation Maintenance MODELS: AKRS-35B/N-L AKRS-50B/N-L AKRS-7B/N-L AKRS-90B/N-L READ AND SAVE THIS MANUAL V.01304

2 CONTENTS 1. Feature/Benefits. Notes/Precautions 3. Model Number Nomenclature 4. Technical Data 4. 1 Parameter table 4. Dimension 4.3 Performance curves 4.4 System diagram 4.5 Components Installation 5.1 Heat pump unit installation 5. Water system installation 5..1 Water tank installation 5.. Water piping installation 5.3 Power source installation 5.4 Wire controller installation Commissioning 6.1 Preparation before commissioning 6. Commissioning Controller Operation 7.1 Illustration for the keys 7. Illustration for LCD display 7.3 Water temperature setting 7.4 Clock setting 7.5 ON/OFF time setting 7.6 Timer mode setting 7.7 Timer cancelling Circuit Drawing 9. Maintenance and Trouble Shooting 9.1 Maintenance 9. Failure code checking 9.3 Common failures code 9.4 Parameter checking and adjustment 9.5 Parameter number and description table 9.6 The manometer instruction 9.7 Trouble Shooting

3 1 Features/Benefits Application Ranges The Thermal Master Series is designed for Domestic hot water for houses, small commercial buildings such as hotels, offices, hospitals, apartments, butcheries, bakeries, hairdressing salons and numerous other applications. The hot water outlet range is wide from minus 0 C to 60 C, meeting requirements for most hot water projects. The unit performs in an ambient temperature range from Minus 10 to 43 C. A modular control system is available to meet the demand of larger hot water projects. Designed for high efficiency performance over a lifetime of operation. The annual average COP is up to 4.5 depending on the ambient conditions. The water pipes and refrigerant pipes must be well insulated to minimize heat loss. Durable and Long Life High efficiency compressors are standard on all units, with safety features for protection against high temperature and high pressure. The tube in shell heat exchangers are capable of dealing with corrosion, hard water, high pressure and power outages. Strong Cabinet Standard unit fabrication consists of heavy gage galvanized sheet metal cabinet construction that provides maximum strength. All interior sheet metal surfaces are powder-painted for maximum corrosion protection to ensure long term durability. Compact, stackable cabinets are designed to minimize installation space. Notes/Precautions The installation, commissioning and maintenance of the system should only be done by qualified personnel with adequate knowledge of the relevant standards and local regulations as well as experience with similar systems. Please make sure the water flow is sufficient all the time. All ground line connections must be prepared in accordance with relevant local regulations. To reduce the risk of electrical insulation faults, you first make the connection of the protective conductor of the heat pump safe according to local regulations. When installation,make sure that the inside Hot Water Series Low Noise Levels Compressor rubber feet are especially selected for reducing vibration. Compressor sound jackets are standard for every unit. Well balanced fans and fan motors, with optimized fan mounting, contributes to low noise operation. The cabinet internally is insulated to reduce noise transmission Reliable Design and Strict Quality Control Standard safety features for the refrigerant circuit include high pressure switch and low pressure protection to detect loss of refrigerant, as well as low water flow. Equipment safety features include water loop temperature monitoring, voltage protection, water coil freeze protection. All safety features are tested and run at the factory to assure proper operation of all components and safety switches. All components are carefully designed and selected for endurance, durability and carefree day to day operation. Each unit is fully tested for performance and safeties prior to leaving the factory. Simple Maintenance and Serviceability Full access for maintenance or service is provided from the maintenance panel, for better flexibility in confined spaces. Easy removal of control the box from the unit provides access to all refrigerant components. The refrigerant circuit can be easily tested and serviced through the use of high and low pressure ports integrated on the refrigerant circuit. wires are apart from hot or moving parts [eg: compressor, fan] of the system to avoid damage to the wires. Anti-freezing measures must be well done to avoid damage to the water system and the heat pump water heating exchanger prior to switching on. Please make sure the lifting and transportation is safely undertaken, according to the heat pump size, weight and structure. It is very dangerous to work on any of these units without first isolating the electricity from the mains power source. When installing the system, please ensure that no contaminants enter the water cycle system. 1

4 3 Model Number Nomenclature AKRS- 50 B/ N-L Seri es of disti ncti on Refrigerant Type Power Supply Case Structure Heating Capacity Heat Pump Type L- L Series N - R410a S - 3 phase Omit - Single phase B- horizontal fan discharge 35-1 HP HP 7 - HP HP AKRS - air to water 4. Technical Data 4. 1 Parameter table AKRS-35B/N-L AK RS-50 B/N -L AKRS-7B/N-L AKRS-90B/N-L Heating Capacity kw Power Supply V/Ph/Hz 0/1/50 0/1/50 0/1/50 0/1/50 Input Power kw Running Current A Max. Input Power kw Max. Running Current A Refrigerant R410a R410a R410a R410a Compressor Mitsubishi Toshiba Mitsubishi Toshiba Compressor Type Rotary Rotary Rotary Rotary Compressor Quantity Outlet Water Temp ºC Max. Outlet Water Temp ºC Hot Water Yield L/h Water Flow 3 m /h Condenser Tube in shell Tube in shell Tube in shell Tube in shell Water Pressure Drop Kpa Water Connection Tube mm Dn0 Dn0 Dn0 Dn0 Noise db(a) <5 <53 <54 <55 Electric Protection I I I I Mechanical Protection IPX4 IPX4 IPX4 IPX4 Net/Gross Weight kg 40/48 55/65 65/79 73/87 Dimension mm 750*64* *8* *30*60 100*30*60 Packing Dimension mm 875*370* *380* *395* *395*760 Measuring condition: Dry/wet bulb temp 0ºC/15ºC; Water inlet/outlet temp 15ºC/55ºC.

5 4. Dimension H L A W B Model AKRS-35B/N-L AKRS-50B/N-L Length(mm) Wide(mm) 64 8 Height(mm) A(mm) B(mm) AKRS-7B/N-L AKRS-90B/N-L High Pressure Gauge Water Outlet Water Inlet Controller Cable Hole Power Cable Hole 3

6 4.3 Performance curves Model: AKRS-35B/N-L 5000 Heating Capacity Curves 4500 Heating Capacity (W) Ambient Temp. ( ) C O P C u r v e s C O P A m b i e n t T e m p. ( ) 4

7 Model: AKRS-50B/N-L Heating Capacity (W) Heating Capacity Curves Ambient Temp. ( ) C O P C u r v e s C O P A m b i e n t T e m p. ( ) 5

8 Model: AKRS-7B/N-L Heating Capacity Curves 9000 H eating C apacity (W) Ambient Temp. ( ) C O P C u r v e s C O P A m b i e n t T e m p. ( ) 6

9 Model: AKRS-90B/N-L H eating C apacity (W) Heating Capacity Curves Ambient Temp. ( ) C O P C u r v e s C O P A m b i e n t T e m p. ( ) 7

10 4.4 System diagram Heating Mode Water outlet Water inlet High pressure switch Condenser (Tube in shell) 4 way valve Throttling element Compressor Low pressure switch Suction accumulator Evaporator (fin-tube) Defrosting Mode Water outlet Water inlet High pressure switch Evaporator (Tube in shell) 4 way valve Throttling element Compressor Low pressure switch Suction accumulator Condenser (fin-tube) 8

11 4.5 Components Components Photo Features/Advantages Compressor The reliable high efficiency compressor, with R410a gas, can achieve high water temperatures of up to 60 C, while ensuring long life of the compressor. 4-Way valve The 4-way-valve prevents gas mixing and ensures stable defrosting. Condenser The Tube In shell heat exchanger has a large heat exchanging are and is very efficient. Circulation pump Circulation pumps used are Wilo brand and can operate at high temperatures. Evaporator Fan The hydrophilic fin coils have a large surface area and good fin spacing allowing highly efficient heat exchanging to take place, thus significantly improving heat transfer and efficient defrosting. The exterior fan motor, with multiple fan blades, is well balanced. The multiple fan blades run at slower RPM rates, and produce high air volumes, thus reducing noise levels.down 9

12 5. Installation 5.1 Heat pump unit installation Selection of installation position 1. Installation must be simple and allow easy access for later work or servicing.. If the unit is to be installed on the floor, its undercarriage should be raised to avoid being flooded by water in rainy seasons. In snow areas, it is important to prevent accumulated snow from blocking up the air outlet. 3. Drain points or other facilities should be provided next to the unit below the units installed level, to avoid the build-up of condensate water during operation. 4. If installing the unit on a balcony or roof of a building, the installation site must meet the allowable load bearing capacity of the building structure, without compromising the structural safety. 5. Ensure the unit is well ventilated and the direction of air exhaust is kept away from windows of neighbouring buildings and ensure the cold exhaust air cannot cycle back onto the coil. Moreover, adequate service clearance should be maintained around the unit. 6. The unit should not be installed In places with oil, flammable gas or corrosive atmospheres. E.g. sulphur compounds, sulphuric or other acids, heavily polluted air or high-frequency equipment to avoid induction interference. 7. The unit must be installed on reliable a base or framework. Weight capacity of framework should be 3 times of the weight and safeguard measures should be taken to avoid failure of fastenings. 8. Wall mounted installations should be avoided as much as possible as machines may overtime, fall down causing accidents. 9. Do not install the heat pump close to road, garden or path to avoid horizontal splashing on the unit from the road or irrigation systems as this may cause fan bearing or other failures. 10. Keep the unit out of reach of children. Installation in exceptional circumstances(unit:mm)

13 5. Water system installation 5..1 Water tank installation 1. The water tank should be in a place where It is suggested to install the heat pump, the water ambient temperature is as high as possible. tank and the circulation pump on the same level. The height difference between the heat pump. It can be installed either outdoors or on the and the water tank should be no more than roof (some factors such as the size of the water meters, when water tank position is higher than tank and the load bearing capability of the that of a heat pump. building structure should be considered). Installation on rooftops should be on supports 4. Do not install the water tank in a polluted or such as crossbeams or pillars. corrosive area. 3. The water tank should be installed lower than the base of the heat pump. 5.. Water piping installation 1. Drainpipe and overflow pipes should be temperatures) to avoid icing up of the water installed near the unit for draining water more supply pipe and valves. efficiently. Discharge valves are necessary on the drainpipe. 6. Keep the water pipes straight and the pipeline position reasonable; reduce pipe run. Service valves need to be installed before distances as much as possible to reduce water the magnet-valves on the system pipeline for resistance. further inspection 7. Ensure the pipeline and the connections 3. The pressure of the water outlet should be have no water leakage. between 0.3MPa and 0.6MPa 8. The water pressure capability of each part of 4. Please ensure only approved piping SANS the piping system should be tested after the or SABS compliant is used. Final connections installation is finished; drainage should be done must be done in copper as per SANS to maintain a clean internal system. requirements. 9. Measures of heat preservation for the hot 5. In winter, heat preservation may be need to water pipeline need to be conducted after be carried out for water supply valve and the stop checking that there are no water leaks. valve of the system (according to local ambient 11

14 Heat pump installation Check Valve Solenoid Valve Shut Off Valve Y-Shape Filter Water Pump Elec Heater Flow Switch Water Tank Heat Pump Controller Dinning Hall Guest Room Sauna Room Heat Pump Flow Switch (can omit) Filter Water tank temp. sensor Drainage Filter Check Valve 5.3 Power source installation Recommended wire specification Model AKRS-35B/N-L AKRS-50B/N-L AKRS-7B/N-L AKRS-90B/N-L Power Cable Water Pump LCD controller Sensor 3x1.5mm 3x1.5mm 3x.5mm 3x.5mm 3x0.75mm 3x0.75mm 3x0.75mm 3x0.75mm 3x0.35mm 3x0.35mm 3x0.35mm 3x0.35mm x0.35mm x0.35mm x0.35mm x0.35mm Note: the above specification is the minimum size we recommend. Please choose large wires if additional power is required. 1

15 M 5.4. Wire control installation Hot Water Series The wired controller is fixed standard on the maintenance door of the machine; please refer to steps below if you want to remotely install it on the wall: 1. Take down the controller from the machine. Please ensure that the communication wire is connected with the circuit board, separate them from where they match.. Use a screwdriver to open the clip as picture 1, separate the controller as parts, as picture. 3. On the wall that you are going to install the controller, drill holes at a level parallel to the sight line as picture 3. The hole distance needs to be 60mm, diameter is 8mm. 4. Place the plastic screws of the enclosure into the hole, and use the tapping screw (ST4*16 D-1) enclosed to fix the back cover of the controller on the wall, as picture Match the front and back covers perfectly, as picture 5, make sure that it is fixed firmly on the wall. 6. Connect the communication wire well. 1 The front cover The back cover SET mm Φ8 5 6 Outlet of the communication wire M SET Attention: Please do not use sharp edged objects to hit the controller face and keys or it may cause damage. When the controller is fixed on the wall, do not pull the communication wire, or it may cause a poor contact. 13

16 6 Commissioning 6.1 Preparation before commissioning Inspection on the heat pump Check if the outside case and the inside system of the heat pump have been damaged during the transportation. Check if there is still air inside the water system. If there is, use the air vents on the water system and circulation pumps, to purge the air. Inspection on the piping system Check if the water piping system, including water supply pipe, return water pipe, pressure gauge, thermometer, valves, water level switch are installed correctly. All hot water pipes should be lagged. Inspection on the power source system Make sure the power source is in accordance with the specification in the manual or on the heat pump nameplate. Make sure all power connections and control circuits are in place. Make sure all the wiring, grounding and all terminals are strong and reliable. 6. Commissioning The commissioning should be carried out by a qualified professional. Comprehensive inspection of the entire system should make sure that all piping points, and water levels in the tank are higher than the cycling heating outlet and the water outlet, before the commissioning. supply and correct the phases order. Make sure the compressor current is within normal operating range. After switching the power on, turn on the heat pump by pressing the on/off key on the wire control panel. Please check if the fan and the circulation pump are running in the right direction if the unit running from a three phase power source. If not, shut down the power 14

17 7. Controller Operation LCD display Clock and timer ON/OFF Mode selection Up Down Parameter setting 7.1 Illustration for the keys ON/OFF Press it to switch on or off heat pump. Mode selection Press it to select the mode. The sequence is: cooling-heating. Long press it for more than 6 seconds,heat pump will come to defrosting. During parameter setting, press it to adjust parameters; During clock and timer setting, press it to choose the hour value or minute value. Up and Down Press them to adjust the value of water temperature, clock, timer, parameters; During failure checking and parameter checking, press any of them to exit checking. Setting checking and confirm Long press it for more than 6 seconds, you can check and adjust the parameters. Press the UP/DOWN key to exit operation. When a failure occurs, press it for no more than seconds, you can check the failure code. Press it again you can check the other failure code if more than one occurs. Press the UP/DOWN key to exit checking. Clock and timer Key Press it to set clock and timer. Detailed operation will be described in following pages. During parameter setting, press it to change the rolling direction of parameters. 15

18 7. Illustration for LCD display Top area Middle area Temperature setting symbol, the figure under is the temperature value. Water tank temperature symbol, the figure under is the temperature value. Parameter number symbol, the figure under is the parameter number. Outllet water temperature symbol, the figure under is the temperature value. Parameter value symbol, the figure under is the parameter value. Failure symbol. Bottom area ON Turning on timer symbol. It appears when setting turn on timer. OFF Circulation pump running. Cooling mode symbol / Defrosting symbol(flash). Heating mode symbol. Auxiliary heat source start. Turning off timer symbol. It appears when setting turn off timer. Clock symbol. It appears when setting time. This symbol means heat pump has two compressors. 7.3 Water temperature setting When the heat pump is switched on, just press or to adjust water temperature. For example press Initial state 16

19 7.4 Clock setting! ATTENTION! At the first time, the time should be defined according to local time zone; Otherwise, the accuracy of Timer on/timer off would be influenced. Set the system time according to the local time as follows: Step 1 Step Step 3 Press the to start clock setting, symbol flashes. Press to select hour and the hour value flashes. Press or to adjust the hour value. Step 4 Step 5 Step 6 Press to select minute and the minute value flashes. Press or to adjust the minute value. Press to confirm the value and return to normal display. Normal display The current time is adjusted from 13:0 to 15:30 17

20 7.5 ON/OFF timer setting! ATTENTION! If you want to use the function of Timer on/timer off, the system time has to be detected whether it is correct in advance. The setting method is referred to page 0 Clock setting. With this function, the heat pump can turn on or turn off automatically at the set time. When the time point of Timer on is arrived, the heat pump starts; thereafter, the on/off could be controlled automatically based on the setting temperature. When the time point of Timer off is arrived, the heat pump is shut down; subsequently, the machine could no longer be controlled automatically based on the setting temperature; it will be restarted until the next time point of Timer on is arrived or the key is pressed. Totally 1 ON/OFF timers can be set. And they can be applied to use for every day or only one day. In timer setting status, the figure below NO represents the timer sequence. If it shows --:--- on bottom, it means timer invalid. Below examples show how to set the heat pump to switch on at 9:10 and switch off at 1:30. Step 1 Step Step 3 Press setting. twice to start ON time Press to select hour and the hour value flashes. Press or to adjust the hour value. Step 4 Step 5 Step 6 please turn to the next page Press to select minute and the minute value flashes. Press or to adjust the minute value. Press to confirm the value and turn to normal display. 18

21 Refer to the previous page or brought forward (b.f.) Step 7 Step 8 Step 9 Press setting. to start OFF time Press to select hour and the hour value flashes. Press or to adjust the hour value. Step 10 Step 11 Step 1 Press to select minute and the minute value flashes. Press or to adjust the minute value. Press to confirm the value and turn to normal display. Normal display 19

22 7.6 Timer mode setting: Hot Water Series Timer is effective either on the day or on every day, where the default is the latter. If you want to set only Timer on the day is effective, please modify the [No.1] parameter in the table on page 30 through wired controller. The default mode is timer recurrence. Please refer to following steps to set one-day timer: Step 1 State of running Initial state Long press( 6 seconds) State of standby Step Step 3 No.1 The incoming electric memorized sign 1 represent on every day is effective Step 4 Parameter No. Value [ Please correspond to the serial number in the table on page 34] Press to turn to parameter No.1 Press to select the value Adjust the value Step 5 0 represent on the day is effective Press or Confirm State of running State of standby 0

23 7.7 Timer cancelling: To cancel the timer, please refer to the instruction for timer setting and set it to be ---:--- via the M key. Please check below example for cancelling timer. Step 1 Step Step 3 Press for twice Press M button Step 4 Step 5 Press M button Step 6 Press M button Step 7 Confirm of Timer on is canceled and enter into the normal display. Step 8 Press to turn to Timer off adjustment. Step 9 Press M button Step 10 Press M button Normal display Press M button Confirm the section of Timer off is canceled and enter into the normal display. Represent the section of Timer has been canceled. 1

24 8. Circuit drawing Model: AKRS-35B/N-L, AKRS-50B/N-L, AKRS-7B/N-L

25 Model: AKRS-90B/N-L 3

26 9. Maintenance and Trouble Shooting 9.1 Maintenance The reliability and operation life of the heat pump can be increased by regular inspection and effective maintenance. The external water filter strainer should be cleaned regularly to ensure the cleanness of the water in the system and avoid damage caused by a blockage in the filter. All protective settings in the unit have been set in the factory and should not be changed. Regular inspection is required of the power source and the wiring connections of the electrical system. Loose wiring connections and electric components should be repaired immediately to avoid damage. The water supply system, pressure relief valve of the water tank, water level control device and air discharge device need to be checked regularly in case of low circulation water volume caused by air entering the system, and to ensure enough capacity and reliability of the heat pump. Check the water pump and the valves on the pipes if they work well and make sure there is no leakage from connectors or final connections. Check the internal pipes and refrigerant service port for oil. Make sure there is no refrigerant leakage Before switching off the heat pump for a prolonged period of time, drain out all water in the pipes, and shut off the power supply. Full inspection and commissioning of the system is required before start up again. Clean the condenser coils with diluted phosphoric acid of 15% consistence under the temperature of 50C-60C. Run the circulation for 3 hours and then flush with fresh water 3 times. When installing the pipes, add a 3-way valve on the pipes and shut off on outlet of it, for cleaning use. Corrosive or harmful substances used as washing liquid is forbidden to clean the condenser as this may be ingested by a person after the service work has been completed and the system is operational again. Clean the inside of the water tank after being used for a period(usually two months, and according to local water quality.) Keep the surrounding area of the heat pump dry, clean and ventilated. Regularly clean the evaporator to maintain high heat exchanging efficiency. 4

27 9. Failure code checking When a failure occurs, it will show failure symbol on the screen.press ( seconds) you can check the failure code. You can press it again to check another failure code if more than one occurs.press or to exit. State of turning on Failure code display area, E- means no failure. If another faiure code, please refer to the bottom of this page in [Common failures and maintenance], the corresponding failure to understand the cause and solutions. Hot Water Series Normal display Short press ( seconds) Press or button to exit. State of turning off Normal display Short press ( seconds) 9.3 Common failures code failures Refrigerant leak(system 1) Refrigerant leak(system ) Press or button to exit. Low pressure protection/pressure valve break down (system 1) Low pressure protection/pressure valve break down (system ) High pressure protection/pressure valve break down (system 1) High pressure protection/pressure valve break down (system ) Water tank temp. sensor failure Water outlet temp. sensor failure Evaporator coil temp. sensor failure (system 1) Evaporator coil temp. sensor failure (system ) Discharge gas temp. sensor failure (system 1) Discharge gas temp. sensor failure (system ) Discharge temp. protection( Discharge temp. is too high)(system1) Discharge temp. protection(discharge temp. is too high)(system) Error phase or lack of phase with power supply Ambient temp.sensor failure Water flow fault or water flow switch breakdowm LCD controller fault PCB s memory fault 5 Display P9 EA PF EF E4 E8 P3 E1 P1 P5 P P6 E3 E7 PA P7 Pd En E5

28 9.4 Parameter checking and adjustment The system parameters can be checked and adjusted via the controller. But they should not be changed casually, especially by house owners.! Warning! This operation is reserved to facilitate future service and maintenance. All parameters should not be changed casually, especially by house owners! How to check and adjust parameters: Parameter No. [ Please correspond to the serial Step 1 number in the table on page 31. ] Step Step 3 Value Long press ( 6 seconds) to enter parameter checking mode. Press (short press) again and again Press to start parameter to choose parameter that needs adjusting. setting and the parameter flashes. If press, the rolling directionwill be converted(+ to - or - to +). Step 4 Step 5 Press or to adjust the value.. Press to confirm the value Press or to return to normal display. Normal display 6

29 9.5 Paramete r number and descriptio n are liste d in th e fo llowing ta ble. No. Content Scope Default Memorized station 0 The incoming electric memorized sign 0-no effective 1-effective 1 The main board 1 Daily circulation sign 0-no effective 1-effective 1 the wire control panel the setting area X ~10,Unit: 3 The main board 3 the setting area Y 0 ~3,Unit: 0 The main board 4 The interval for defrosting 15~99,Unit:minute 45 The main board 5 Defrosting-on temperature -9~5, Unit: -3 The main board 6 Defrosting-off temperature 5~0,Unit: 10 The main board 7 Compressor s exhaust air protection 90~10,Unit: b8: means 118 The main board 8 Evaporator coil temperature 1 Unit: Scope:-9-80 No Setting 9 Discharge gas temperature 1 Unit: 98: means 98 A8: means 108 b8: means 118 No Setting 10 ambient temperature Unit: Scope:-9-80 No Setting 11 Compressor continuous running time Unit:minute Scope:0-99 No Setting 1 Fan continuous running time 1/4 Unit:Second No Setting 13 Compressor auto-off code 1 No Setting 14 On-off imported state Especial:sixteen No Setting 4 Auxiliary heat source 0-no effective 1-effective 0 The main board 5 Water tank temp./water outlet temp. -5~5, Unit: compensation 1 The main board 9 Evaporator coil temperature Unit: Scope:-9-80 No Setting 3 Compressor auto-off code No Setting 37 Discharge gas temperature Unit: 98: means 98 A8: means 108 b8: means 118 No Setting 48 Start ambient temp.(auxiliary heat source) ~15, Unit: 7 The main board Remark:the machine off code(the No. 13, No. 3 parameter in the previous table): :Water tank temp. sensor breakdown 0:Defrosting preparation 3:Evaporator coil temp. sensor breakdown 1:Defrosting finish 4:Discharge temp. sensor breakdown :Error phase or lack of phase with power supply, 5:Discharge temp.is too high, thanshop the machine then shop the machine 11:Anti-frozen finishing,than shop the machine 7:Low-pressure switch cutting 1:High-pressure switch cutting :High-pressure switch cutting during water tank 13:Meet set temp temp. is high 14:Controller power off 3:High-pressure switch cutting during dofrosting 19:Water flow switch breakdown 9.6 Hot Water Series The manometer is a kind of high pressure equipment, when the heat pump is on, the manometer pointer would point to the pressure value of refrigerant, the max. value of protection is 4kg/Cm. When the heat pump is off, the pointer would point to the same value as actual ambient temperature (e.g. 8 C) and related air pressure (e.g.18kg/ Cm ). Please check the manometer when you restart the heat pump after not using for a long time, if it shows ambient temperature valve is smaller than C(When the ambient temp. is higher than C), it means that refrigerant has leaked a lot, and you need to confirm with professional engineer as soon as possible. 7

30 9.7 Trouble shooting Users should contact with the professional maintenance staff when there is a problem with the heat pump. Maintenance stuff may need to refer to the following table for troubleshooting. Malfunction Possible Problems Disposing Methods Heat pump unit is out of operation. 1. Power source fault.. Loose connection of power wire. 3. Power fuse burnt out. 4. Low water level switch is not on. 1. Cut off the power source and check.. check the power wire connection. 3. Check the fuse. 4. Supply water until the water level switch is on. Water pump is running but no water circulation or much noise made by water pump 1. Few water in the system.. Air exists in the water system. 3. Some valves are not opened. 4. The water filters is blocked up. 1. Fill water into the water supply system.. Discharge air from the water system. 3. Open all the valves in the system. 4. Clean the water filter. Low heating capacity. Heavy frosting, low heating capacity. High noise of compressor. 1. Lack of refrigerant.. Bad water system heat preservation. 3. Low evaporator heat transferring. 4. Low water flow volume. 1. The evaporator is too dirty.. Defrost sensor fault. 3. The 4 way valve can not change direction. 4. Over long defrosting duration. 1. Liquid refrigerant into the compressor.. Interior component of the compressor is faulty. 1. leakage hunting and fix it, discharge all the refrigerant and inject the right amount.. improve the heat preservation. 3. Wash the evaporator. 4. Clean the water filter. 1. Wash the evaporator.. Change a new defrost sensor. 3. Check the solenoid if it is energized. 4. Change the temperature for entering defrost and the duration. 1. Check if the thermostatic expansion valve is faulty.. Change the compressor. 8

31 Compressor is out of operation. 1. Power source fault.. Compressor AC contactor damaged. 3. Loosen wire connection. 4. Over-heat protection. 5. Over-high water temp. 6. Low water flow volume. 1. Check the power source and change faulty components.. Change the contactor. 3. Check every wire connection of compressor. 4. Check refrigerant leakage. 5. Bring down the water temp. set value. 6. Clean the filter and check if there is air inside the water system. Fan is out of operation. 1. Fan motor wire loosen.. Fan motor burnt. 3. Fan AC contactor fault. 1. Check every wire of the fan connection.. change the motor. 3. change the AC contactor. Low water flow volume protection. 1. Circulation pump fault.. Circulation pump is too small. 3. Water filter blockage. 4. Flow volume control device restore. 1. Check the operation of the circulation pump and fix it.. Change a bigger pump. 3. Wash the water filter. 4. Adjust or change the flow volume control device. Over-high compressor discharge pressure 1. Low water flow volume.. Thermostatic expansion valve openings is not correct, or blockage. 1. Check the circulation pump, and the water filter.. Check and adjust the openings, or directly change the expansion valve. Over-low compressor suction pressure. 1. Not enough refrigerant.. Over-big pressure drop through the heat exchanger. 1. Check refrigerant leakage.. Check and adjust the expansion valve openings. Shortage of oil in compressor. Shortage of lubricant oil. Find out the suitable kind of oil for the compressor and inject some amount. Thermostatic throttle valve can not start. 1. The switch for it is not open.. Low water pressure, oversmall water pipe diameter, over-long pipe. 1. Inspect the power source of the solenoid valve.. Check if there is blockage in the pipes, and add boosting pump when necessary. 9

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